Network, generic

U0221 Lost Communication With Door Switch G

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0221 is stored when door switch unit G no longer replies. The weak spot is often the passage between door and body, where the harness bends at every opening. FCA STAR cases S1808000031 and S2108000106 (Jeep Compass 2018–2021) describe it: corrosion at the driver door-to-body connector and a badly seated rubber grommet led to intermittent windows, locks and mirrors, rear windows lowering on their own, door-ajar warnings, start/stop dropouts and LIN complaints; the fix was cleaning the connector, seating it fully and aligning the grommet. Those cases list B-codes, not U0221. No manufacturer documents U0221 publicly; which door carries G depends on the maker. No MIL.

Likely causes

Corroded door-to-body connector behind a poorly sealing grommet
Door connector not fully engaged
Wire chafed or broken inside the grommet
Switch unit G failed

Symptoms

  • Windows, locks and mirrors fail intermittently
  • Door-ajar warning while driving
  • Start/stop function stops working at times

Repair estimate

DifficultyMediumDIY possible
Parts and labour€10–350
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

door switch glin bus

Related codes

U0215U0216U0217U0218U0219U0220U0522

References: static.nhtsa.gov, static.nhtsa.gov.